execCommand SaveAs在Firefox中有效吗?

时间:2009-05-07 05:31:40

标签: javascript firefox google-chrome bookmarklet

为什么这不适用于ff / chrome?

javascript: document.execCommand('SaveAs','true','http://www.google.com');

(用作书签)

4 个答案:

答案 0 :(得分:10)

execCommand在浏览器之间没有完全标准化。实际上,execCommand('SaveAs',...)似乎只在IE上得到支持。强制保存的推荐方法 - 如使用内容处置:附件标题,如http://www.jtricks.com/bits/content_disposition.html

中所述

由于这是HTTP标头的一部分,因此您可以在任何文件类型上使用它。如果您正在使用apache,则可以使用.htaccess文件添加标头,如here所述。例如:

<FilesMatch "\.pdf$">
<IfModule mod_headers.c>
Header set Content-Disposition "attachment"
# for older browsers
Header set Content-Type "application/octet-stream"
</IfModule>
</FilesMatch>

答案 1 :(得分:9)

可以通过data URIs在Firefox中执行此操作(另请参阅Download data url file),也可以选择通过下载属性执行此操作。

有关HTML5填充程序演示,请参阅http://html5-demos.appspot.com/static/a.download.html

How to force save as dialog box in firefox besides changing headers?也涵盖了这一主题。

您还可以通过以下经过Firefox测试的演示对其进行测试。

<!DOCTYPE html>
<body>
<script>
var a = document.createElement('a');
//alert(a.download === ''); // If true, this seems to indicate support
a.setAttribute('download', 'testme.png');
a.href = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAwElEQVQ4jWNgGPRgv7Y2z0lj45STpqbHT5iaxhCt8biBgcJJU9PZJ01MPp80MfkPxZOJN8DEpAFJ4/+TJib/T5mY7CdK8wkTkwJ0zVA8naDmk0ZGPjg0/z9hbGyDV/MZY2ORkyYm77FpPmVispwSp6/e7+DAQtj5pqabsdi8myjNUANmY7H99jEjIxWiDDhuauqCxYDD+7W1eYgy4IyxMetJE5PpyH4/ZWqqTZRmGIAm3fsk2YwOjhkZqZCtmVQAAIOlmIi0XoodAAAAAElFTkSuQmCC';
a.innerHTML = 'testing';
a.style.display = 'none';
document.body.appendChild(a);
a.click();
</script>

以下内容也适用于URL以及没有下载属性的JavaScript启动的加载(虽然这种方法不允许使用文件名,但它允许在新选项卡中进行预览):

<script>
var myText = 'Hello world!', 
    myHTML = '<b>'+myText+'</b>';

function openFile (textToEncode, contentType, newWindow) {
    // For window.btoa (base64) polyfills, see 
    // https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills
    var encodedText = window.btoa(textToEncode);
    var dataURL = 'data:' + contentType + ';base64,' + encodedText;
    if (newWindow) { // Not useful for application/octet-stream type
        window.open(dataURL); // To open in a new tab/window
    }
    else {
        window.location = dataURL; // To change the current page
    }
}
</script>

<h1>Hello world files:</h1>

<p>Octet stream type to prompts download dialog in Firefox, but with no 
   default file type or path:</p> 

<a href="data:application/octet-stream;base64,SGVsbG8sIFdvcmxkIQ%3D%3D">
    (text example)</a>
<a href="data:application/octet-stream;base64,PGI+SGVsbG8gd29ybGQhPC9iPg==">
    (HTML example)</a>
<button onclick="openFile(myHTML, 'application/octet-stream');">
    (HTML example, from JavaScript)</button>

<p>Quickly viewable (and manually savable) in browser but no dialog presented:</p>
<a href="data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D">(plain text, same window)</a>
<a href="data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D" target="new-tab">
    (plain text--in new tab)</a>
<a href="data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E">(HTML, same window)</a>
<button onclick="openFile(myText, 'text/plain');">
    (text example, from JavaScript)</button>
<button onclick="openFile(myText, 'text/plain', true);">
     (text example, from JavaScript; open in new window)</button>
<button onclick="openFile(myHTML, 'text/html', true);">
   (HTML example, from JavaScript; open in new window)</button>

答案 2 :(得分:3)

作为Microsoft puts it,“没有适用于此方法的公共标准。”

答案 3 :(得分:0)

Firefox不支持execCommand。事实上,它似乎只是IE浏览器。